using System;

    class QuadraticEquation
    {
        static void Main()
        {
            Console.Write("a = ");
            double a = double.Parse(Console.ReadLine()); //2
            Console.Write("b = ");
            double b = double.Parse(Console.ReadLine()); //5
            Console.Write("c = ");
            double c = double.Parse(Console.ReadLine());//-3
                                  //5*5      4 * 2 * -3
            double discriminant = (b * b) - (4 * a * c);
            if (discriminant > 0)
            {
                double x2 = ((-b) + Math.Sqrt(discriminant)) / (2 * a);
                double x1 = ((-b) - Math.Sqrt(discriminant)) / (2 * a);
                Console.WriteLine("x1 = {0}; x2 = {1}", x1, x2);
            }
            else if (discriminant == 0)
            {
                double x1Andx2 = ((-b) + Math.Sqrt(discriminant)) / (2 * a);
                Console.WriteLine("x1 = x2 = {0}", x1Andx2);
            }
            else if (discriminant < 0)
            {
                Console.WriteLine("No real roots");
            }
        }
    }